I couldn't resist and immediately started to put together the first official prototype and ... did found a problem !!!
Previous articles :
- https://hanixdiy.blogspot.com/2020/05/old-pstn-entry-phone-door-opening-1.html
- https://hanixdiy.blogspot.com/2020/05/old-pstn-entry-phone-door-opening-2.html
- https://hanixdiy.blogspot.com/2020/05/old-pstn-entry-phone-door-opening-3.html
- https://hanixdiy.blogspot.com/2020/06/old-pstn-entry-phone-door-opening-4.html